George alanson mason



(No Model.)

G. A. MASON.

SHORT GIRGUITING DEVICE FOR MAGNBIO CALLS.

N0. 339L672. Patented Apr. 13, 1886.

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UNITED STATES PATENT OFFICE.

GEORGE ALANSON MASON, OF 109 FARRINGDON ROAD, COUNTY OF MIDDLESEX, ENGLAND.

SHORT-CIRCUITING DEVICE FOR MAGNETO-CALLS.

SPECIFICATION forming part of Letters Patent No. 339.672, dated April 13, 1886.

Application filed )[ay 14. i985. Serial No. 165,463.

To all whom it may concern.-

Be it known that I, GEORGE ALANSON MASON, engineer, a citizen of the United States of America, and residing at 109 Farringdon Road, in the county of Middlesex, England, have invented certain Improvements in Shunts or Contact-Variers or Automatic Out-Outs or Short-Oircuiters for Magneto Call or Signaling Bells, or for other Purposes, (for which I have applied for a patent in Great Britain, No. 3,850, dated March 25, 1885,) of which the following is a specification.

Myinvention has for its object to provide a simple and eiiicient arrangement for varying the contact for diverting the passage of a current of electricity as required, the said arrangement being more especially applicable for use with magneto signaling or call bells, but being also applicable to other purposes where a shunt or eircuit-varier or automatic cut-out or shortcircuiter is required.

According to myinvention I actuate the armature of the magneto-electric generator by means of a shaft and a crank-handle in the ordinary way; but I connect the crank-haudle to the shaft so that when first operated it has a movement of rotation imparted to it in dependently of the shaft suflieient to cause a spring to be removed from the short-circuiting contact which it made when the parts were in their normal position, and so that when the crank is operated it throws the armature into the circuit and maintains it in circuit while the crank is rotated; but as soon as the erankhandle is released the said spring or eontaet-piecc automatically returns to its original position, to short-circuit or cut out the coils of the magneto-armature. I effect this by means of a spring contact-strip of a bowed form, and attached at one end to the shaft and at the other end 'to the collar of the crankhandle, the attachment to the shaft being preferably effected by a post rising through a slot in the said collar, so that the said post serves as a stop, the slot allowing the necessary movement of the crank-handle to contract the spring and remove it from its short-circuiting contact, which short-circuiting contact is preferabl y made by a collar-piece surrounding the path through which the spring contact-piece travels as the crank-handle is rotated, so that (No model); Patented in England N arch 25, 1885, No. 3,850.

in whatever position the crank-handle is left after it is released, the spring, on automatically expanding, will bear upon some portion of the said collar.

In the drawings, Figures 1 and 2 are views at right angles to each other of mechanism constructed according to niyinvcntion. Fig. 2 shows the device in its position for making one contact or short-circuiting, and Fig. 3 shows the position when this contact is withdrawn for shunting the current in the required direction.

A is a shaft mounted in a casing or support, B, and G is a crank-handle, and D is a band or gear wheel on the said shaft. These may be of the ordinary kind; but the crank-handle is connected to the shaft by a pin or post, o on the shaft passing through a slot, (2 in the collar d of the handle, so that when the handle is operated it moves for a part of a revolution without turning the shaft A until the end of the slot (1 comes against the post a. A spring-strip, E, is secured at one end to the post a and at its other end to the collar d. \Vhen the parts are in their normal position, as shown in Fig. 2, the said spring-strip E bears upon a ring, f, of metal, forming a lining to the box or bearing on which the shaft A is mounted, or otherwise surrounding the part at which the spring-strip E is situated. hen the spring-strip E bears on this ring f, the required circuit for the current during the time the handle is not operated is completed say, for example, a short-circuit past the coils of the armature of the magneto-machine, by which a current is generated when the handle is rotated.

On the handle being rotated, the slot (2 first allows the collar (1 to move round on the shaft A for a short distance, suflicient to contract the spring-stri p E and withdraw it from contact with the ring f, thus breaking the cireuit before con1pleted,and compelling the current to pass through any other necessary coursesay through the coils of the armature of the inagneto'machine. \Vhen the end of the slot d comes against the post a, as shown in Fig. 3, the handle 0 and shaft A rotate to gether to divert the current or to cause the generation of the current in the usual way. \Vhen the handle is released, the spring-strip E automatically returns to its normal position and completes the short or other circuit through the ring f.

I claim 1. The combination, with a curved or circular contact device, a handle or crank, and a shaft, of the curved spring connected at one end to the handle or crank and at the other end to the shaft, and means, substantially as described, for loosely securing the handle and shaft to each other, so as to allow a limited amount of play to the handle with respect to the shaft, substantially as and for the purpose described.

2. Ashort-circuiting apparatus which comprises in its construction shaft A, handle or crank 0, spring E, connected at one end with the handle or crank and at the other end to GEORGE ALANSON MASON.

Wit'nessesr B. REHFUESS, F. 'BILTON,

Both of 109Farringdon Road, London. 

